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(No Model.) v 2 Sheets-Sheet 1.

C. S. BLACK 8t P. C. PPISTER.

' RECORDING THERMOMETER. No. 354,965. Patented Dec. 28, 1886.

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(No Model.) 2 SheetsSheet 2. G. S. BLACK & P. O. PFISTER.

RECORDING THERMOMETER. No. 354,965.

Patergted Dec. 28, 1886.

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NITED STATES PATENT FFICEQ CHARLES S. BLACK AND PHILIP O. PFISTER, OF NEW YORK, N. Y., ASSIGNORS TO THE DRAPER MANUFACTURING COMPANY, OF NEW YORK.

RECORDING- THERMO METER.

SPECIFICATION forming part of Letters Patent No. 354,965, dated December 28, 1886.

Application filed March 23', 1886. Serial No. 196,25. (No model.)

To aZZ whom it may concern.-

Be it known that we, CHARLES S. BLACK and PHILIP G. PFISTER, citizens of the United States of North America, and residents of the city, county, and State of New York, have invented a new and useful Improvement in Becording Thermometers, of which the following is a specification.

The object of this invention is to provide a simple and accurate registering-thermometer whose record-card is always exposed to view.

The invention consists in the peculiar combinations and the novel'constrnction and arrangement of parts, all as more fully hereinafter described and claimed. Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a rear elevation of our improved thermometer. Fig. 2 is a side elevation of the same, with an edge of the case removed to exhibit the interior parts. Fig. 3 is an enlarged front elevation of the same with the front of the case removed. Fig. 4 is an enlarged front elevation of certain details of the mechanism. Fig. 5 is an enlarged side elevation of the parts shown in Fig. 4:. Figs. 6, 7, and 8 show certain details of construction.

In the drawings, Arepresents the thermometer-case, having in its back, near its base, a curved slot, at, as shown.

B represents a fiat compound bar of steel and brass, having secured to its upper end, by clamp and screw b, a disk, I) having a stud or swivel, b, projecting at right angles to the edge of said bar, and on the lower end of said bar B a yoke, O, is secured, with its cross-bar 0 extended at right angles across the front edge of the bar B, and with its arms 0' 0 projected forward parallel with each other and with the sides of the said bar B, as shown in Fig. 8, in which it is represented detached and in an inverted position. One of these arms, 0, is. rigid, and the other, 0 is spring-steel or other metal, as indicated in said Fig. ,8.

The bar B, with its attachments above described, is secured to the back of the case A by screwsd, entering through the disk 1) into the said case, the swivel I) being entered or inserted into a corresponding opening in said case, so that it may be free to turn therein. The screws d are of less diameter than the screw-holes d in said disk, as shown in Fig.

1, in which the heads of the screws are broken 5 5 off to better show this feature, so that there is sufficient play to these screws in the screw holes to allow the swivel to revolve on its axis so much that the lower end of the compound quarters of an inch, or thereabout; hence this arrangement of swivel and screws is used to roughly set the thern1o1neterthat is to say, if it is found necessary for adjustment to move the recording-pencil through, say, 30 or 40.

WVhen the bar B is secured on the case A, the arms of the yoke 0 project inward through the slot at, which is designed to be long enough to permit free adjustment and swing or movement of the bar B within desired limits. A short platinum pin, d whose functions will be hereinafter set forth, is passed from side through the handle of the yoke O and the lower end of the bar B, as shown in Fig. 8.

Another feature of our invention is the seg- 7 5 ment-lever D, (shown enlarged in Figs. 4 and 5,) consisting of a short flat bar of metal having its upper end laterally widened and fashioned on top into the shape of a segment of a circle, with its edge slightly grooved, as shown atf, Fig; 5, and in the body of said lever D a perpendicular slot, f, and two screw-holes, are made, and an adjusting screw or setter, f whose functions will hereinafter be explained, is fixed in it from front to rear. y

WVe sometimes use an electrical connection, (indicated more particularly in Figs. 1 and 2 by the parts lettered E, s, o, w, in, X, K, and K but as no claim is made here to it, further description is unnecessary.

The pencil-1ever F is a flat strip, preferably of hard rubber, having a hole, Z, in the upper end for holding the recording-pencil Z, whose point is arranged to rest upon the face of the recording-card G, which is pivoted in the case 5 and is designed to be revolved by clockwork. (Not shown.)

An arbor, H, provided with a shoulder, m,

bar may be moved through a space of three- 5;

as shown in detail and detached in Fig. 7, is screwed from the front into the back of the case A, in the position shown in Fig. 2, in which only the end of the screw is shown at the back of the case, and on this is fitted a sleeve, H, Figs. 2, 5, and 6, which is held in place, so that it may revolve on said arbor, by a terminal screw, m. This sleeve H has two shoulders, at n, Fig. 6, and rigidly secured on the said sleeve at right angles thereto and against the said shoulders are plates'o respectively, the plate 0 having a lengthwise slot, p, in each end, and the plate 0. having screw-holes p, as shown in Fig. 6. This sleeve H is inserted through the slot f of the segment-lever D and over the arbor H, and said lever D is held vertically adjustable in place by screws 9 Fig. 5, which are inserted th rough the slots 1) in the plate 0, Fig. 6, and into the lever screw-holes f Fig. 4. The pencil-lever F is then put in place on the sleeve H, as shown in Figs. 2 and 5, and secured there by being screwed to the sleeve-plate 0, Fig. 6, and then the terminal screw m is fixed in place to hold the sleeve in position.

The bar B expands or contracts with the rising or falling of the temperature to which it is exposed, and consequently bends to the one side or the other, as the case may be, and produces motion. This motion'is transmitted to the segment-lever D by means of a wire or chain, I, of suitable material, which is arranged as indicated in Figs. at and 5. One end of said wire or chain is firstsecured to arm 0' of the yoke C, and the wire is then passed over the segmental top of the lever D, in the groove thereof, and then down to the setter or adjusting-screw f and twice around it, and then through the hole f, (see Fig. 5,) through its diameter, and then twice more around said setter, and then from it up over the other shoulder of the segment, and along in the groove f thereof to the opposite arm,

- c, of the yoke G, where it is secured, as indicated. The arm 0 being of spring metal, suffices to keep this wire or chain properly stretched or at a proper tension throughout its length, and the, wire being passed through the setter cannot slip when the latter is used to regulate or set the parts.

The normal position of the lower end of the compound bar B will be determined in advance in each case by the extremes of temperature the thermometer is required to record. 7

By means of the swivel V, as aforesaid, the bar B may be roughly adjustedsay 30 to 4.0and by means of the screws h the nicer relative adjustment of the parts may be made. By turningthe 'setterf the wire I is drawn in one direction or the other, as the case may be, for the purpose ofnloving the lever D and pencil-lever F slightly to one side or the other when it is desired to regulate or set the latter a degree or a fraction thereof.

It will be seen that the curving or lateral the sleeve H to the pencil-lever F, to give it lateral motion, the extent of which its pencil "records on the revolving card in corresponding degrees of temperature.

The slot f in the segment-lever D permits the shortening or lengthening of said lever above its fulcrum, the sleeve H, as it may be found necessary to decrease or increase the power of said lever, and thereby define the limits of the swing of the attached pencil-lever F, and the slots 19 in the plate 0 permit such adjustment of the lever D. A weight, M, adj ustably secured on the lower end of the segment-lever D, serves as a counter-balance to the upward extensions of the two levers D F,

We make no claim in this case, broadly, to the arrangement of the wire connecting the segmentlever and the yoke, as that will form -the subject-matter of a separate application which we are about to make.

Having thus described our invention, we claim as new and desire to secure by Letters Patent-- i 1. A recording-thermometer containing the following elements: a case having a suitable chart, a compound bar attached to said case, a yoke connected to said bar, asegment-lever, a wire or chain connecting the segment-lever to the yoke, a partially-revolving sleeve or shaft, on which said lever is mounted, and a recording lever mounted thereon, substantially as shown.

2. A recording-thermometer containing the following elements: a case having a suitable chart, a compound bar, aswiveled connection between said case and the bar, a yoke connected to said bar, a segment-lever, a wire or chain connecting the segment lever to the yoke, a setting device for adjusting said lever with respect to the compound bar, a partiallyrevolving sleeve or shaft, on which the segment-lever is mounted, and a recording-lever mounted on said sleeve.

3. In combination with the operating-wire I, the compound bar B, and, as a means of straining the operating wire I, a yoke, 0, provided with one rigid and one spring arm, substantially as described.

4. In a recording-thermometer, the combination of a yoke, 0, attached to a compound bar, B, with the segment lever D and the wire I, stretched in said yoke, for transmitting the motion of the compound bar to the lever without friction, substantially as described.

5. In a recording-thermometer, the combina'tion,with the yoke 0, connected to the compound bar B,and the segment-lever D, of the wire .I, having its opposite ends connected to the yoke and passing twice over the curved edge of the segment and around a point under the same, substantially as described.

6. In a recording-thermometer, the combination of the yoke 0, connected to the compound bar 13, the segment-lever D, and the our invention we have signed our names, in wire I, having itsopposite ends connected to I presence of two witnesses, this 5th day of 10 theyoke and passing twice over the curved March, 1886.

edge of the segment,with a setter, 7, around CHAS. BLACK.

5 which said wire is coiled for the purpose of PHILIP O. PFISTER.

adjusting the position of the recording-leyer, Witnesses: substantially as described. J AOOB J. STORER, In testimony that we claim the foregoing as- P. B. WHELPLEY. 

